It was possible to cause the use of a MessagePort after it had already been freed, which could potentially have led to an exploitable crash. This vulnerability affects Firefox < 120, Firefox ESR < 115.5.0, and Thunderbird < 115.5.
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
| Link | Tags |
|---|---|
| https://bugzilla.mozilla.org/show_bug.cgi?id=1854076 | issue tracking permissions required |
| https://www.mozilla.org/security/advisories/mfsa2023-49/ | release notes vendor advisory |
| https://www.mozilla.org/security/advisories/mfsa2023-50/ | release notes vendor advisory |
| https://www.mozilla.org/security/advisories/mfsa2023-52/ | release notes vendor advisory |
| https://www.debian.org/security/2023/dsa-5561 | third party advisory |
| https://lists.debian.org/debian-lts-announce/2023/11/msg00017.html | mailing list |
| https://lists.debian.org/debian-lts-announce/2023/11/msg00030.html |